Introduction
The component with part number 3500/90 125728-01 is a critical module within the Bently Nevada* 3500 Machinery Monitoring System. This part number refers to the 3500/90 Keyphasor Module.
The Keyphasor® signal is the fundamental timing reference for an entire machinery monitoring system. This module accepts a signal from a proximity probe or magnetic pickup observing a keyway or notch on a rotating shaft. It then produces a clean, timed pulse (the Keyphasor signal) once per shaft revolution. This pulse is distributed to all other monitoring modules in the 3500 rack, providing a synchronized reference for measuring vibration phase lag, speed, and for timing transient data capture.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/90 125728-01 Keyphasor Module.
| Parameter | Specification |
|---|---|
| Part Number | 3500/90 125728-01 |
| Module Type | Keyphasor Module |
| Compatibility | Bently Nevada 3500 Series Racks |
| Number of Channels | 2 independent Keyphasor channels |
| Input Signal | Accepts signals from proximity probes or magnetic pickups. |
| Input Threshold | Adjustable for different signal levels. |
| Primary Function | Generates a once-per-revolution timing pulse (Keyphasor signal) for the entire monitoring system. |
| Output | Provides a conditioned Keyphasor signal to the 3500 rack backplane for use by all other monitoring modules. |
| Power Requirement | Powered directly from the 3500 rack backplane. |
| Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 200 mm (7.5 in x 1.6 in x 7.9 in) *Standard 3500 Series full-size module slot.* |
| Weight | Approx. 0.45 kg (1.0 lb) |
Application Scenarios
The 3500/90 Keyphasor Module is an essential component for any machinery train where phase-related diagnostics or speed-based analysis are required. Its application scenarios are foundational to advanced machinery protection and diagnostics.
Vibration Phase Measurement:
The primary application. The Keyphasor pulse provides the phase reference, allowing vibration monitors (like the 3500/42M or 3500/40M) to determine the angular position of the heavy spot on a rotor. This is absolutely critical for conducting field balancing.
Rotor Speed Measurement:
By counting the Keyphasor pulses per unit of time, the system can accurately determine and display the rotor's rotational speed (RPM).
Synchronization for Transient Data Capture:
During startup and shutdown (transient periods), the Keyphasor signal is used to synchronize the capture of vibration data. This allows for the creation of Bode and Polar plots, which are essential for analyzing a machine's dynamic response through its critical speeds.
Diagnosing Specific Rotor Faults:
Phase information is vital for diagnosing faults such as unbalance, cracked shafts, rotor rub, and shaft misalignment. The Keyphasor signal makes this analysis possible.
Providing a Common Timing Reference:
On multi-rotor trains (e.g., a turbine driving a compressor), a Keyphasor module on each shaft provides a synchronized timing mark, allowing engineers to analyze the dynamic relationship between different rotors.
Typical Machinery Requiring a Keyphasor:
Steam Turbines and Gas Turbines
Centrifugal and Axial Compressors
Large Pumps and Motors
Generators
Any machine where in-situ balancing or detailed transient analysis is performed.
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